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A PPARC funded project
AstroGrid Intro & Demo
John TaylorInstitute for
Astronomy, Edinburgh
Sydney29-Jul-2005 The AstroGrid/Euro-VO infrastructure - SC4DEVO-3 2
Contents :What's a virtual observatory?What do you need to make one?AstroGrid – glue for the Euro-VODemoPlugging into AstroGrid
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Virtual Observatory“The VO vision can be summed up as the desire to make all archives speak the same language − all searchable and analysable by the same tools, all data sources accessible through a common interface, all data held in distributed databases that appear as one.”Andy Lawrence, 09/2003
Take all the world's Astronomical data, and all the world's applications and computing power and make it appear that they reside on the user's desktop.
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AstroGrid Components
PAL
PALPAL
CEA CEA
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AstroGrid Components
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Building a VO - Layer Diagram
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Locating data and applicationsIVO-standard registryRegistries harvest from each otherXml-based query language ADQL
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WorkflowOrchestrate servicesQueries and workflows are designed using the portal – other clients on the wayWork is run remotely and asynchronously Archives searched and results manipulatedResults are stored in a virtual file system Queries and workflows can be re-used and shared
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Demo
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What now?AstroGrid Release 1 is up and running now
http://www.astrogrid.org/release
http://wiki.astrogrid.org/bin/view/Astrogrid/ReleaseV1Pages
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Contacts and infoEdinburgh: John Taylor [email protected] (general info,
getting an account, installing the software) Bob Mann [email protected] (collaborations,
VOTech DS6 Lead) Martin Hill [email protected] (dataset access)
Background Info on AstroGrid http://www.astrogrid.org
Download the Euro-VO AstroGrid software from: http://software.astrogrid.org
A PPARC funded project
Integrating tools into AstroGrid
John TaylorInstitute for
Astronomy, Edinburgh
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Classes of Tool
Server-side – e.g. xmatch, moviemaker, pixel-zClient-side – e.g. Topcat, Aladin, VizIVOMixed – RSV, Google-Earth
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Pure Client Side toolsJust send and receive data from VOSpaceCould also query databases or start CEA apps?No custom server side application required or bespoke communication protocols
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Communicating with AG components
SOAP interfacesAstroGrid client delegates (Java only)AstroGrid Client Runtime (ACR)
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Noel's slide here
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Example Code - Java
serviceURL = new URL(“http://127.0.0.1:8001/xmlrpc”);xmlrpc = new XmlRpcClient(serviceURL);Vector args = new Vector();args.add(“Browse”);args.add(Boolean.TRUE);String fileURL = (String) xmlrpc.execute("dialogs.resourceChooser.chooseResource", args);
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Example Code - Python
s = x.Server("http://127.0.0.1:8001/xmlrpc")resource = s.dialogs.resourceChooser.chooseResource("Select a file",True)
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Demo – xmdv tool
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Data format issuesEach tool will have own data formatAstronomers love VOTableXSLT from VOTable to custom
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What next?VOTech to provide (even) easy (ier) to use library to access the ACRLend me your toolsMake your tools pluggable
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Questions for the floorWhat proportion of tools fall into this “pure client side” category?Integrate ACR with the filesystem? Any ideas?Can we use an ACR-style technique for inter-tool communication?
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Closing infoContacts: John Taylor [email protected] Bob Mann [email protected] (VOTech DS6 Lead) Noel Winstanley
[email protected] (AstroGrid Client Runtime author)
Background Info on AstroGrid http://www.astrogrid.org
Download the AVO AstroGrid software from: http://software.astrogrid.org
